[Python] IndexError: At least one sheet must be visible

def multiple_dfs(sheet, row=2):

writer = pd.ExcelWriter("testing.xlsx", engine='openpyxl')

f1 = {
'user': ['Bob', 'Jane', 'Alice'],
'income': [40000, 50000, 42000],
}

f2 = {
'amount': ['Chest', 'Bras', 'Braa'],
'income': [40000, 50000, 42000]
}

frames = [f1, f2]


for f in frames:
try:
wb = load_workbook("testing.xlsx")
ws = wb.get_sheet_by_name("aaa")

writer.wb = wb
writer.sheets = dict((ws.title, ws) for ws in wb.worksheets)

row = ws.max_row + 2
except:
pass

df = pd.DataFrame(f)
df.to_excel(writer, sheet, startrow=row, index=False)
writer.save()
# writer.close()

multiple_dfs('aaa')


I got this error, but I can't fix it. I adapt this short representation of what is happening in my code, but it is hard to see where is the real problem. Here is the

Traceback (most recent call last):
File "create_and_update_xlsx_sheets.py", line 144, in <module>
create_and_update_worksheets()
File "create_and_update_xlsx_sheets.py", line 140, in create_and_update_worksheets
writer.save()
File "/home/jeremie/.virtualenvs/NHL/lib/python3.5/site-packages/pandas/io/excel.py", line 824, in save
return self.book.save(self.path)
...
File "/home/jeremie/.virtualenvs/NHL/lib/python3.5/site-packages/openpyxl/writer/workbook.py", line 61, in get_active_sheet
raise IndexError("At least one sheet must be visible")
IndexError: At least one sheet must be visible


How could I fix that issue?

P.S. Be aware that error is displayed half the time.

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